Tubular container for electrical condensers or other apparatus



p 1948. P. A. SPORING ETAL 2,450,310

TUBULAR CONTAINER FOR ELECTRICAL CONDENSERS OR OTHER APPARATUS Filed June 27, 1945 Patented Sept. 28, 1948 TUBULAR CONTAINER FOR ELECTRICAL CONDENSERS OR- OTHER APPARATUS Percy Archibald Sporing, Hampton Hill, and

Charles Piercy Johnson, Hanwell, England, assignors to The Telegraph Condenser Company Limited, North Acton, England, a British com- Application June 27, 1945, Serial No. 601,836 In Great Britain July 20, 1944 7 Claims. 1

The present invention relates to that type of electrical apparatus, such as condensers, housed within a tubular metal container to which it is desired that one pole of the apparatus shall be electrically connected. Such apparatus forms the subject of, for example, co-pending Patent Application No. 601,829 and, according to the specification of that application, the desired electrical connection to the container may be effected either by forming it closed at one end except for a small hole through which a leading-out wire extends and is soldered to the container, or by closing the end of the container by a bung of resilient material through which the leading-out wire extends, the bung being loaded with conductive material in powder form whereby it is rendered electrically conductive. Each of these methods of effecting the desired electrical connection is open to certain disadvantages. In the first case, owing to the fact that it is not a practical proposition in the case in which the container is of aluminium to make the connection by a soldering operation, the use of that metal for the container in prohibited, such use, however, particularly for certain types of condenser, being highly desirable. On the other hand, the employment of a bung rendered conductive in the above manner is open to the objection that its electrical resistance is a very variable quantity, depending to a large extent on the degree to which the bung is compressed on insertion in the container; also frequently the electrical resistance introduced by the employment of such a bung is higher than desirable. It is the object of the present invention to overcome these drawbacks and to provide means for making the required electrical connection between one of the poles of the apparatus and the metal tubular container which shall be satisfactory under all operative conditions and of the necessary low ohmic resistance.

According to the invention, at one end of the tubular container a leading-out wire or its equivalent extends through an insulating bush, such as a resilient bung, and surrounding the container there is a metal collar provided with a lug which is electrically connected with the leadingout wire. In order to ensure adequate contact between the collar and the tubular container, the former is preferably made of such diameter as to permit its being readily slipped over the container, around which it is then gripped, for example, by inserting the combination in a chuck or collet which is then tightened.

In order that the invention may be clearly understood and readily carried into effect, it will now be described more fully with reference to the accompanying drawing which illustrates, by way of example, various ways of carrying it into effect and wherein:

Figure 1 is a side view and Figure 2 an end view of a metal collar and lug employed according to the invention,

Figures 3 and 4 are respectively side and end views of a tubular container for an electrical condenser to which the collar and lug are applied, and

Figures 5 and 6 are side views showing two methods of employing lugs for support of the container.

Referring to the drawings, Figures 1 and 2 illustrate a metal ring I which constitutes the collar adapted to surround the tubular container, the said metal ring being provided with a lug 2 which is preferably formed integral with the ring, but may be initially separate and attached to the ring by riveting, soldering or in any other suitable manner. One convenient way of forming the collar I and lug 2 integrally with it is by bursting a hole in a metal plate, the upstanding edge of the burst hole serving to constitute the collar. The remainder of the plate is then cut away except for a portion left to constitute the lug 2 or two or more lugs for use as described below. In this case the lug or lugs would extend initially at right angles to the axis of the collar I and would then be bent to lie substantially parallel to it.

As seen in Figures 3 and 4, the collar I is slipped over atubular container 3 for an electrical condenser or other apparatus, from which there extend leading-out wires 4 through closing bungs 5 of rubber or the like. After the collar I has been placed in position, it is tightened around the container 3 by means of a chuck or collet, the reduction in the diameter being allowed for by the formation, in the tightening operation, of ribs or wrinkles 6 in the collar I. In many cases adequate electrical contact between the collar I and container 3 will result, but, if desired, these two members may be united by a soldered joint. In that case it may be unnecessary to deform the collar in order to grip the container as above described. The lug 2 is bent over to make electrical contact with one of the leading-out wires 4, being for this purpose preferably bifurcated at its end as seen in Figure 1. The two arms of the fork may be wrapped around the wire 4 and, if desired, the lug 2 and wire 4 may be united by solder.

In the modification depicted in Figure 5, the collar I is provided with a second lug I employed as a means for supporting the container 3. For this purpose, as indicated, the lug 1 is shaped so as to stand oif from the container 3 by an amount sufiicient to permit the combination to be placed over the edge of a plate 8 by which it is desired that it shall be supported. The lug I is soldered or otherwise fixed to the plate 8 so that the combination is held in place relatively to the plate.

In the modification shown in Figure 6, the tubular container 3 extends through an aperture in a plate 9 and the collar 1 is provided, in addition to its connecting lug 2, with two supporting lugs l0 each of which extends through the aperture in the plate 9 and is bent over, as indicated, to make contact with the surface of the plate. The lugs 10 serve to retain the container 3 in the aperture in the plate 3 by reason of their attach-- ment to the plate by soldering, rivets, screws, or :2

other equivalent device.

What we claim and desire to secure by Letters Patent of the United States is:

1. A metal tubular container for electrical apparatus having in combination an insulating bush located in and occluding one of the open ends of said container, a conductor extending through said bush into the container i or electrical connection with the electrical apparatus therein, a metal collar surrounding'and in conductive contact with said container, a metal lug attached to said collar and in electrical connection with said conductor, an additional lug on said collar and extending substantially parallel to the axis of the container, and a supporting plate extending between said additional lug and the container and attached to said additional lug.

2. A metal tubular container for electrical apparatus having in combination an insulating bush located in and occluding one of the open ends 1-.

of said container, a conductor extending through said bush into the container for electrical connection with the electrical apparatus therein, a metal collar surrounding and in conductive contact with said container, a metal lug attached to said collar and in electrical connection with said conductor, a supporting plate having an aperture through which said container extends, and at least one additional lug on said collar and attached to said supporting plate.

3. A container for electrical apparatus such as a condenser, comprising a tubular metal container in which the apparatus is housed, an insulation bush secured in and closing an end of the container, an electric current conductor in electrical connection with said apparatus and extending through and outwardly of said bush in the axial longitudinal direction of the tubular container, a conductor lug electrically connected at one end with the wall of the container and extending therefrom beyond the bush containing end of the container and oblique to the axial center of the container, and means forming an electrical connection between the other end of said lug and said conductor.

4. A container of the character stated in claim 3, wherein said conductor lug is in the form of a fiat strip and the said means electrically connecting the other end of the lug with the conductor comprises a bifurcation in which the conductor is frictionally secured.

5. A container for electrical apparatus such as a condenser, comprising a tubular metal container in which the apparatus is housed, an insulation bush secured in and closing an end of the container, an electric current conductor in electrical connection with the said apparatus and extending through and outwardly of said bush in the axial longitudinal direction of the tubular container, a metal collar encircling and in electrical connection with the container, a conductor strip integral with the collar and extending from the said end of the container oblique to the axis of the container for intersection at its free end with the conductor, the said free end of the lug being in electrical connection with the conductor.

6. A container of the character stated in claim 5, in which the electrical connection of the said free end of the lug with the conductor is in the form of a bifurcation in the end of the lug in which the conductor is frictionally secured.

7. A container for electrical apparatus such as a condenser, comprising a tubular metal container in which the apparatus is housed, an insulation bush secured in and closing an end of the con-- tainer, an electric current conductor in electrical connection with the said apparatus and extending through and outwardly of said bush in the axial I longitudinal direction of the tubular container,

a metal collar surrounding and in conductive contact with said container, a metal lug attached to said collar and in electrical connection with said conductor, and an additional lug attached to said collar and extending substantially parallel to the axis of said container.

PERCY ARCHIBALD SPORING.

CHARLES PIERCY JOHNSON.

REFERENCES CITED The following references are of record in the idle of this patent:

UNITED STATES PATENTS Number Name Date 1,483,218 Fahnestock Feb. 12, 1924 1,726,543 Curtis et al Sept. 3, 1929 1,885,227 Buchanan Nov. 1, 1932 2,121,590 Espe June 21, 1938 2,137,809 Rodgers Nov. 22, 1938 2,147,418 Bahls Feb. 14, 1939 2,301,786 Millermaster Nov. 10, 1942 FOREIGN PATENTS Number Country Date 359,346 Great Britain Oct. 22, 1931 553,544 Great Britain May 26, 1943 

